<template>
	<view>
		<!-- 使用指定义搜索组件 -->
		<!-- <my-serach :bgcolor="'black'" :radius="20"></my-serach> -->
		<my-serach @click="gotoSearch"></my-serach>
		
		
		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
				<block v-for="(item , i) in cateList" :key="i">
					<view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<view class="cate-lv2-title">/{{item2.cat_name}}/</view>
					<view class="cate-lv3-list">
						<!-- 三级item项 -->
						<view class="cate-lv3-item" v-for="(item3 , i3) in item2.children" :key="i3" @click="gotoGoodList(item3)">
							<!-- 图片 -->
							<image :src="item3.cat_icon.replace('dev','web')" mode="widthFix"/>
							<!-- 文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>
				</view>
				
			</scroll-view>
		</view>
	</view>
</template>

<script>
	import badgeMix from "@/mixins/tabber-badge.js"
	
	export default {
		mixins:[badgeMix],
		
		data() {
			return {
				// 当前设备可用高度
				wh:0,
				// 分类数据列表
				cateList:[],
				// 当前选中项的索引，默认第一项
				active:0,
				// 二级分类列表
				cateLevel2:[],
				scrollTop:0
			};
		},
		onLoad() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight - 50
			
			this.getCateList()
		},
		methods:{
			async getCateList(){
				const {data : res} = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !==200) return uni.$showMsg()
				this.cateList = res.message
				
				// 二级赋值(显示第一次的时候默认第一个)
				this.cateLevel2 = res.message[0].children
			},
			// 点击切换
			activeChanged(i){
				this.active = i
				// 二级列表重新赋值
				this.cateLevel2 = this.cateList[i].children
				
				// 切换时滑动置顶
				this.scrollTop = this.scrollTop ===0 ? 1:0
			},
			
			// 点击图片去到商品详情页 
			gotoGoodList(item){
				uni.navigateTo({
					url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
				})
			},
			// 去搜索
			gotoSearch(){
				uni.navigateTo({
					url:"/subpkg/search/search"
				})
			}
		}
	}
</script>

<style lang="scss">

.scroll-view-container{
	display: flex;
	
	.left-scroll-view{
		width: 120px;
	}
	
	.left-scroll-view-item{
		background-color: #f7f7f7;
		line-height: 60px;
		text-align: center;
		font-size: 12px;
		
		&.active{
			background-color: #fff;
			position: relative;
			
			&::before{
				content: "";
				display: block;
				width: 3px;
				height: 30px;
				background-color: #87ceeb;
				position: absolute;
				top: 50%;
				left: 0;
				transform: translateY(-50%);
			}
		}
	}
}

.cate-lv2-title{
	font-size: 12px;
	text-align: center;
	font-weight: bold;
	padding: 15px 0;
}

.cate-lv3-list{
	display: flex;
	flex-wrap: wrap;
	.cate-lv3-item{
		width: 33.33%;
		display: flex;
		flex-direction: column;
		align-items: center;
		margin-bottom: 10px;
		
		image{
			width: 60px;
			height: 60px;
		}
		text{
			font-size: 12px;
		}
	}
}
</style>
